During decarburization procedures the vacuum system must operate long time in a rough pressure range. An efficient gas-cooling is necessary as the extracted sizzling gases would otherwise overheat the filter and vacuum program.
With the development of technology and the improvement of product quality in aerospace, energy, iron 
and steel digesting, pharmaceutical and chemical industries, these Gas-Cooling Roots Pump china industries have to obtain a specific vacuum environment. Simultaneously, the vacuum system used by these industries can be continuously raising, and the vacuum level is continuously increasing. Moreover, the state’s environmental security, energy conservation and three wastes discharge to the above-talked about industries, etc. The requirements are more stringent. At the moment, the prevailing dry vacuum pumps available, such as for example screw vacuum pumps and claw vacuum pumps, are unable to meet the requirements of oil-free large pumping rate clean vacuum environment proposed by these industries due to the restrictions of pumping velocity characteristics and structural mechanism.
In view of the shortcomings of the prevailing technology, the technical problem to be solved by the utility model is to provide an all-gas-cooled vacuum system to satisfy the use in a clean vacuum environment with large oil-free pumping speed.